I am kind of confused about using the _at_ keyword to assign a specific address to a variable.
so for example :
extern xdata char variable _at_ 0x000f;
it fills 3 bytes in xram . can any one explain how is the compiler handling these sequence. Thank you !
Yes, but equally you know that I was not referring to __at__.
You were referring to a declaration that contains non-standard keywords, and basically by definition the standard cannot describe what the compiler should do with such a line.
Interestingly enough, the compiler documentation contains detailed examples on how to define variables using the _at_ keyword, and how to use these variables in a different source file than they were declared in.
You are missing the point. The issue in hand is that the 'extern' keyword, when applied to a variable definition, does not make it an "extern ref".
I should hope the manual documents the usage of all non-standard extensions.